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![]() RHF wrote in message om... PETE, It is good to hear that this 'project' is still in the works. - - - My comments [RHF] have been inserted into your message. kutgw ~ RHF . . = = = "Pete KE9OA" = = = wrote in message ... Hi folks, Things have been going a million miles an hour! Right now, I am working on a low noise VCO design, with a tracking filter at the output. I have also been looking at a dual conversion chipset that Phillips came out with for the auto radio industry. These devices are used in the Cambridge Audio Model T500 FM/AM Tuner. Performance is pretty amazing on the MW band, [RHF] Regeneration in a 'stand-a-lone' Shielded Ferrite Rod AM/MW Antenna would be a nice/useful feature. This would naturally be 'tunable' across the AM/MW Band and function as a 'tuned' RF Front end for the Radio - Would It Not? This will definetely be a tunable device; it is the only way to go. [RHF] The Spectrum Display is a 'nice idea' for an Option of Accessory: - But what does that do to the price and basic afordability? - - A built-in AM Sync Detector and PBT are a more important features to me. If I go with the single conversion route, I wouldn't be able to have the PBT, but Sync AM is definitely in the works. I will definitely be working on a steep skirted filter that has a flat passband. [RHF] The "MODS" on the R-75 eGroup for the R75's AM/MW Sync-Detector make it a good performer. http://groups.yahoo.com/group/icomr75/files/ [RHF] Also the basic AM/MW Sync-Detector in the Grundig Satellit 800M is a good performer. I have played with that receiver, and it does sound good. I want to come up with a design that tracks the signal all the way down into the noise. I think that a big part of it will be having a long enough time constant on the loop filter, so that if a signal fades out, there is enough hysteresis to "hang on". The tradoff is acquistion time of the system, but I think that I will be able to find a happy medium. About the R75................I never did do the Sync mod to mine. I never use that function. About the only thing I do is remove those MW attenuators. Anyway, it looks like the majority of my e-mails have asked about Sync detection, so this is the path I will follow on this design. Thanks for all of your input! Pete |
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